# year=input()
# year=int(year)
year=int(input())

# if year>18:
#     shoufei=20
# else:
#     if year>5:
#         shoufei=10
#     else:
#         shoufei=0

if year>18:
    shoufei=20
elif year>5:
    shoufei=10
else:
    shoufei=0

print('费用:',shoufei)